DEERE 750C Series II Speed issues with codes

Hello everyone! I've been having trouble with my Deere 750C series II speed control. It just started a couple days ago, I was operating and speed suddenly went to 1 on its on. I turned it off let it sit a while and it worked fine on start up, but continued to do it off and on the rest of the day, at one time doing the opposite and running up to 3 and sticking but back to 1 when code flashed. I was getting the codes F654 and F658 randomly. Took the speed switch out of the joystick to examine/clean it and it worked fine for a whole day after. Yesterday it went back to 1 speed and hasn't moved no matter what. I've checked all the visible wires for shorts etc. and I don't see anything. While I was working on it, it did work fine for a minute but then back to 1 with code. I've listed the codes below. Any help is appreciated!



F654: B12 (1/2 mph) Transmission Speed Control Switch / Signal Voltage Under 0.5V /



F658: B9 Decelerator Sensor and B12 Trans. Speed Control Sensor (Single Lever Steer) / Excitation Short to Ground